Nevertheless, I can see how much effort it costs him every time I see him performs those tasks. Because I can see him pause to think of the sequence of the things he needs to do to achieve the result for some very basic stuff.
If you have to constantly think about how to use your pen instead of what you are writing about, it's a problem.
But it's an invisible problem if you are attached to your tools, you will never notice it. It's not possible, your tools are so great, they save you time, they make you more efficient, they are most comfortable.
At this stage it's part of his identity.
I can't say for you, as I don't know your particular situation.
But that's definitely the case for him and for several vim + tiling users that I know.
They spent years investing in this.
They will never say anything but good things about it.
But they wills start working on a project, and spend 30 minute fixing something before they can even start on the task. Then every single step requires planning for the basic moves.
If you look at how they work, the tools are taking a toll, inch by inch.